Metal coil



March 10, 1942. s. NYBERG 2,275,458

METAL COIL Original Filed July 12', 1939 2 Sheets-Sheetl 55 J5 a4 n 0 0o00 0 00 0006 0 0000 00 o yl A A A A A A/uA A 3mm 0 Sid/10119? March 10,1942.

s. NYBERG METAL 0011;

Patented Mar. 10, 1942 1 METAL con. Stonc Nyberg, Dover, Ohio, assignorto Agnes J. I

Reeves Greer, Morgantown, W.

Original application July 12, 1939, Serial No. 284,058. Divided and thisapplication May 20. 1940, Serial No. 336,186

2 Claims.

The invention relates to the coiling of metal coils preparatory topickling the coils and is especially adapted for properly preparing thecoils for pickling in pickling machines of the general type disclosed inGreer Patent No. 2,091,- 921, issued August 31, 1937; Shoemaker PatentNo. 2,120,843, issued June 14, 1938; and Greer Patent No. 2,196,210,issued April 9, 1940; and the present application is a division of myprior application Serial No. 284,058, filed July 12, 1939, and theinvention pertains to the coils formed by the method and apparatusdisclosed in said parent application.

The general type of pickling machines above referred to differ from thecontinuous strip pickling machines in which the metal is uncoiled andpassed through the pickling machine in strip form, in that the picklingmachines referred to provide means for pickling the coil without un--coiling the same, this being accomplished by supporting the coils uponmandrels which suspend the coils in the pickling and'washing solutions,the mandrels being rotated in order to rotate the coils within thesolutions.

For this purpose it is necessary that the convolutions of the coils beopened up or separated while in the pickling bath so that none of theconvolutions will remain in contact with each other in the bath, thusgiving the pickling acid free access to every portion of the surfaces ofthe metal, as otherwise the pickled metal will be marred by black spotsor marks where the acid has not had accessto the surface of the metal.In the patents and application abovereferred to the coil shown is aconventional spiral comprising a continuous curve from the center to theoutside of the coil. This frequently results in two of the convolutionsof a coil contacting with each other for some distance while the coil isin the pickling solution, thus; preventing the acid from properlycontacting the opposed surfaces of these convolutions of the coil andresultingin an improperly pickled coil having black spots upon thesurfaces which are thus not properly exposed to the action of the acid.Greer Patent No. 2,191,463 for Method and apparatus for recoiling metalcoils, dated February 27, 1940, discloses a method and apparatus forforming coils having projections in the form of angular bends in theconvolutions of the coil T to keep the same properly spaced or-separatedwhile in the pickling solution, and has been found to work entirelysatisfactorily in use for pickling in machines such as the abovementioned patents.

The present invention is in the nature of an improvement upon oraddition to the disclosure in said Greer Patent No. 2,191,463, andcontemplates the formation of a coil having projections in the form ofbuttons or ribs formed in the convolutions .of the coil to hold the sameseparated or spaced from each other, and this invention is applicablenot only to coils to be pickled in machines such as the above mentionedpatents, but may. also beused for separating the convolutions of thecoil to be pickled by the old method which is still in use in many smallplants, wherein the convolutions of the coil are separated by short bentrods or hairpins, as they are familiarly called, which are insertedbetween convolutions of the coil which is then placed on end in a tub ortank in which either the coil or pickling acid is agitated.

One object is to provide for the formation of a coil of continuousspiral form excepting for slight projections in the form of buttons orribs formed around each convolution to space adjacent convolutionstherefrom.

A further object is the provision of such a coil in which theprojections may be irregularly spaced around each convolution thereof.

A still further object is the provision of such a coil in which theprojections may be oppositely 'disposed and uniformly spaced throughoutthe length of the metal strip forming the coil whereby when the coil issuspended upon a mandrel the uniformly spaced, oppositely disposedprojections in the convolutions above the mandrel will cooperate witheach other in the manner of gear teeth so as to prevent each convolutionof the coil from moving relative to adjacent convolut ions whereby theconvolutions of the co l will be prevented from winding or tighteningup.

The above objects together with others which will be apparent from thedrawings and following description, or which may be later referred tomay be attained in the manner illustrated in the accompanying drawingsin which Figure l is a sectional elevation of a machine for formingprojections upon the coil in the manner above stated in general terms;

Fig. 2. an elevation of a coil formed in accord- Fig. 4, a plan view ofa portion of an uncoiled strip with projections thereon such as shown inthe coil of Fig.2;

Fig. 8, a similar view showing the projections I in th form of shortribs staggered across the strip; and

Fig. 9, a similar view showing the projections in the form of ribsextending transversely across the strip.

Similar numerals refer to similar parts throughout the several views.

The metal coil to be recoiled for pickling in accordance with thepresent invention is uncoiled and may be fed through a machine such asillustrated in Fig. 1 for forming projections upon the metal andrecoiling the same, the projections spacing apart the severalconvolutions of the coil.

The machine may include spaced housings l within which are journaled alower roll II and a cooperating, vertically adjustable upper roll l2.These rolls are provided with complemental projections and recessesaround their exteriors for the purpose of forming the projections in themetal coil.

- In order that projections of any desired shape or kind may be formedin the coil either through the center thereof or near or at the edges orin various other arrangements, these projections and recesses upon therolls may be formed upon removable die blocks l3 adapted to beadjustably mounted in longitudinal grooves 14 provided in the rolls.

As shown in the drawings each of these die blocks may be of dove-tailshape so as to fit the correspondingly inclined side wall I! of thegroove at one side and the correspondingly shaped side wall I6 of theclamping and retainingstrip II on the other side.

Th metal may be fed to the rolls l2 by means of a pair of feed rolls Iiiand for the purpose of breaking or loosening any scale which may bepresent upon the surfaces of the metal a vertically adjustable roll 2!maycooperate with the feed rolls 20.

The dies may be arranged for producing substantially button-likeprojections 3| at irregularly spaced intervals throughout the center ofthe metal 32 in the manner indicated in Fig. 4.

It should be understood that the dies may be arranged to place thesebutton-like projections at uniformly spaced intervals throughout thecenter fot the strip, if desired, -or by properly positioning two dieblocks in each groove ll of the rolls II and I2, these projections maybe formed near opposite edges of themetal strip and may be eitherirregularly or uniformly spaced as desired.

In Fig. is shown a portion of a metal strip in which the projections areoppositely. disposed as at 33 and 34 so that when the metal is recoiledto form a coil as indicated generally at 35 in Fig. 3, the oppositelydisposed projections 33 and 34 will be arranged throughout theconvolutions of the coil in the manner illustrated in said figure.

In Fig. 6 is shown the manner in which substantially half-roundprojections 36 may be formed in opposite edges of the metal strip andthese projections may be either uniformly or irregularly-spaced, asdesired.

Fig. '7 showsjainother arrangement of the button-like projections- 3|located in staggered arrangement across the metal strip, and Fig. 8

shows a similar arrangement of slightly elon- 5 gated or rib-likeprojections 31.

If desiredfthe projections may be in the form oi ribs 38 extendingentirely across the strip, as shown in Fig. 9. I

As the projections are formed in the metal strip the same is wound intoa substantially spiral coil upon the drum 39, the projections beinglocated around each convolution of the coil thus formed spacing theconvolutions apart.

If desired, the coil may be opened up to any desired extent by engagingthe loose outer end thereof in the stop 40 and rotating the coiling drum39 in reverse direction until the desired result is obtained. i

The coil thus produced may then be placed upon a mandrel, indicatedgenerally at 4| in Fig. 2, in such position that the coil is suspendedwithin a pickling tank 42 and the mandrel may be rotated by any suitablemeans for rotating the coil around the same. 25 The projections 3| uponeach convolution of the coil will thus prevent the several convolutionsfrom contacting with each other while in the pickling solution, thus,permitting free access of the pickling acid to the entire surface of thecoil.

Should any of the projections 3| contact with the surfaces of theadjacent convolutions of the coil due to the tightening of theconvolutions caused by rotation upon the mandrel'this will not surfaceof the coil at these points, since the rotation of the coil around themandrel causes a continual movement of the convolutions of the coilrelative to each other and these slight points of contact arecontinuously changing their positions.

The type of oppositely disposed projections 33 and 34 shown in Figs, 3and 5 is especially designed to prevent any considerable windingmovement or tightening of the convolutions of the coil relative to eachother.

As illustrated in Fig. 3, this is accomplished by the oppositelydisposed projections of the different convolutions engaging each otherin the portion of the coil above the mandrel.

. The action is somewhat similar to a plurality of ring gears, thedownwardly disposed projections 34 of each convolution having only aslight movement in either direction between the upwardly disposedprojections 33 of-thenext adjacent convolution. 1 According to theprovisions of the patent statutes, I have explained the principle of myinvention and described one embodiment thereof, but I desire to have itunderstood that within the scope of the appended claims the inventionmay be practiced otherwise than as specifically illustrated anddescribed, the invention residing in the formation of projections in theconvolutions of the coil to hold the convolutions spaced from each otherin the pickling solution, regardless of whether these projections are ofthe particular conformation of theprojections illustrated and described.

I claim:

l. A metal coil comprising a continuous spiral sheet of metal composedof a plurality of convolutions, said metal sheet having spacedbuttonlike projections of predetermined height formed therein throughoutthe surface .of said sheet and prevent the pickling solution fromcontacting the functioning to space each convolution from an adjacentconvolution at least a distance equal to the height of said projections,the convolutions of said coil being loosely positioned with respect toeach other and separated throughout the major portion of their surfacesfrom adjacent convoiutions a distance greater than the thickness of thesheet plus the height of the button-like projections so as to permitrelative movement between adjacent convolutions.

2. A metal coil comprising 'a continuous spiral sheet of metal composedof a plurality of con- 7 volutions, said metal sheet having spacedbuttonlike projections of predetermined height formed a distance greaterthan the thickness of the sheet plus the height of the button-likeprojections so as to permit relative movement between adjacentconvolutions.

STONE NYBERG.

